When I edit a disqus comment (seconds after posting), both comments remain.

Also, both get tweeted when I have that option enabled.

Ideally, only the edited version would be tweeted, but I know this would only be possible with a time delay (not desired), so it would be nice if, when editing a disqus comment, a tweet either didn’t happen at all (let people read my unedited comment only) or (best) a dialog asks me if I also want to tweet the edited version.